They also have bulbous bills that add to their slightly comical appearance. Our online platform, Wiley Online Library () is one of the world’s most extensive multidisciplinary collections of online resources, covering life, health, social and physical sciences, and humanities.Macaroni penguins are funny looking things, mainly due to the conspicuous orange and yellow crests that protrude from the center of their foreheads. With a growing open access offering, Wiley is committed to the widest possible dissemination of and access to the content we publish and supports all sustainable models of access. Wiley has partnerships with many of the world’s leading societies and publishes over 1,500 peer-reviewed journals and 1,500+ new books annually in print and online, as well as databases, major reference works and laboratory protocols in STMS subjects. Wiley has published the works of more than 450 Nobel laureates in all categories: Literature, Economics, Physiology or Medicine, Physics, Chemistry, and Peace. has been a valued source of information and understanding for more than 200 years, helping people around the world meet their needs and fulfill their aspirations.
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Wiley is a global provider of content and content-enabled workflow solutions in areas of scientific, technical, medical, and scholarly research professional development and education. Some evidence is presented to support this hypothesis. It is suggested that during egg development the rate of yolk deposition increases with time and that the small A-egg, which is initiated first, develops for a period when the rate of yolk deposition is below maximum. A physiological basis for the intra-clutch egg dimorphism is proposed. It is suggested that, in contrast to the assumption made by most hypotheses, the cost of egg production in crested penguins is very low, and that consequently the selection pressure required to maintain a two-egg clutch may also be low. These results do not support the idea that birds maximise investment in the large B-egg.
Although B-egg weight varied by up to 73% between individuals the relative size of the two eggs within the clutch remained the same, the A:B-egg weight ratio being 0.62. A- and B-chicks did not differ in physical size at fledging. However, in one year there was no difference in fledging weight between A- and B-chicks and in the second year A-chicks were only 7% lighter than B-chicks at fledging. At hatching, A-chicks averaged 55% of B-chick weight. I studied survival and growth to fledging of A- and B-chicks at experimentally-manipulated nests, and individual variation in relative investment by adult females in A- and B-eggs, in macaroni penguins, E. In crested penguins, Eudyptes spp., the first-laid (A) egg is smaller than the second-laid (B) egg and although viable rarely survives to hatching.